How many movies have Junpei Yamaoka and Kotaro Koizumi collaborated on?

They have worked on 2 movies together! Their first movie together was 氷室想介の事件簿～超高層ビル密室殺人の謎～ (2022) and was their highest rated movie together. They have not worked together since 氷室想介の事件簿２～ベストセラー⼩説に隠された殺⼈事件の謎～ (2023).